VLBI OBSERVATIONS OF A COMPLETE SAMPLE OF RADIO GALAXIES - VIII - PROPER MOTION IN 3C-338

We present new VLA, MERLIN, and VLBI images for the radio galaxy 3C 33 8 and the results of the monitoring of its arcsecond core flux density . Present high-sensitivity observations allow us to investigate the ra dio structure of this source and to confirm the presence of two symmet ric parsec-scale jets. Morphological changes between different epochs are evident, and a proper motion with beta similar to 0.4 h(-1) has be en derived. This allows us to give a lower limit for the Hubble consta nt. While the steep-spectrum large-scale structure of 3C 338 could be a relic emission, the small-scale structure looks young, similar to th e high-power medium-sized symmetric objects (MSOs) found at high redsh ift.